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		<h1>Introduction</h1>
        <p> Dasty3 is a web client for visualizing protein sequence feature information using <a href="http://www.biodas.org">DAS</a>. Through the <a href="http://www.dasregistry.org/">DAS registry</a> the client establishes connections to a DAS reference server to   retrieve sequence information and to one or more DAS annotation servers   to retrieve feature annotations. It merges the collected data from all   these servers and provides the user with a unified, aesthetically   pleasing, effective view of the sequence-annotated features. Dasty3 uses   AJAX to deliver highly interactive graphical functionality in a web   browser by executing multiple asynchronous DAS requests. </p>
        <p> Technically, Dasty3 is web-browser compatible, lightweight, independent   from third party software, easy to integrate into other web based   systems, efficient when loading and manipulating annotations, highly   configurable and customizable, and interactive and intuitive for users.   By being web-based, it is more readily accessible to biological   researchers, as they do not need to install specialized software to run   it. Being JavaScript-based, it is easy for developers to integrate it   into their own web systems. Customizability aids this. The use of AJAX   improves efficiency when displaying information. Finally, because of its   independence from large, complicated third-party libraries and its   modularity, Dasty3 is easy to extend. </p>
        <p> Visually, Dasty3 provides numerous advantages over other DAS clients.   Space is used effectively so there is no need to scroll in portions of   the screen. It makes use of the standard colours employed by Uniprot and   SRS for annotations. Dasty3 uses colours, borders, complimentary shades   and separating lines to contrast features with the background and to   make the relationships among annotations clear. Finally, Dasty3 allows   grouping and sorting of annotations by various properties, and zooming   within a protein sequence.</p>
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